MESON Chess Problem Database

Problem Display
PID: 260166 (1R2B3/1N1qN3/p1b1p2Q/Pk1P4/5R2/B3p1p1/2K2p2/4bn2 w - - 0 1)

Somma, Francesco

L'Echiquier, 1926

1R2B3/1N1qN3/p1b1p2Q/Pk1P4/5R2/B3p1p1/2K2p2/4bn2

#2

10 + 10

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe7
      • 2.Bxc6#
    • 1...Qd8
      • 2.Bxc6#
    • 1...Bb4
      • 2.Rxb4#
    • 1...Bxa5
      • 2.Sd6#
    • 1...Sd2
      • 2.Rb4#
  • Tries
    • 1.Sxc6?
      • threat
        • 2.Sa7#
        • 2.Sd6#
      • 1...Qxc6+
        • 2.Bxc6#
      • 1...Qxb7
        • 2.Rxb7#
      • 1...Bxa5
        • 2.Sd6#
      • 1...exd5
        • 2.Sa7#
      • 1...Bb4
        • 2.Rxb4#
      • 1...Qc8
        • 2.Sd6#
      • 1...Qd6
        • 2.Sa7#
        • 2.Sxd6#
      • 1...Qc7
        • 2.Sd6#
      • 1...Qh7+!
    • 1.Bxd7?
      • threat
        • 2.Bxc6#
      • 1...Bxa5
        • 2.Sd6#
      • 1...Bxd7!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Qe2#
      • 1...Qxd5
        • 2.Bxc6#
      • 1...Qxb7
        • 2.dxe6#
      • 1...Bxa5
        • 2.Sd6#
      • 1...Bxd5
        • 2.Bxd7#
      • 1...Bxb7
        • 2.dxe6#
      • 1...Bb4
        • 2.Rxb4#
      • 1...Sd2
        • 2.Rb4#
      • 1...e2
        • 2.Qxe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(j);OGATE,P_SPINB(h),XS(H)::B(J),XB(h)
    • Q(j);OGATE,P_SPINB(h)::B(J),XB(h)
    • B(a);N_GUARD::R1(C),XB(a)
    • B(a);SBLOCK,XP(D)::R(I)+S(G),DCHECK
    • S(b);S_CUTB(a)::R1(C)
  • Tries
    • Try
      • S(H);XB(h)
      • Threat
        • DUALS(2)
      • Vars
        • Q(j);CHECK,OGATE,P_SPINQ(j),XS(H)::B(J),XQ(j)
        • Q(j);OGATE,P_SPINQ(j),XS(G)::R(I),XQ(j)
        • B(a);XP(D)::R(I)+S(G),DCHECK
        • P(i);XP(E)::S(H)
        • B(a);N_GUARD::R1(C),XB(a)
        • Q(j);P_PINS(H)::R(I)+S(G),DCHECK
      • Refutation
        • Q(j);CHECK
    • Try
      • B(J);P_PINB(h),XQ(j)
      • Threat
        • B(J),XB(h)
      • Vars
        • B(a);SBLOCK,XP(D)::R(I)+S(G),DCHECK
      • Refutation
        • B(h);N_SPINB(h),XB(J)
  • Actual
    • Q(F);
    • Threat
      • QAB(F)
    • Vars
      • Q(j);OGATE,P_SPINB(h),P_SPINQ(j),XP(E)::B(J),XB(h)
      • Q(j);N_GUARD,P_SPINB(h),P_SPINQ(j),XS(G)::QAR(F)+P(E),XP(i)
      • B(a);SBLOCK,XP(D)::R(I)+S(G),DCHECK
      • B(h);OGATEB,P_SPINB(h),P_SPINQ(j),XP(E)::B(J),XQ(j)
      • B(h);N_GUARD,P_SPINB(h),P_SPINQ(j),XS(G)::QAR(F)+P(E),XP(i)
      • B(a);N_GUARD::R1(C),XB(a)
      • S(b);S_CUTB(a)::R1(C)
      • P(d);::QAB(F),XP(d)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).